Micrometeoroid



micrometeoroid
(mī’krō-mē’tē-ə-roid’)
An extremely small meteoroid, typically the size of a grain of dust. Particles measuring less than 0.05 mm (0.002 inch) in diameter are classed as micrometeoroids. Despite their small size, their high velocities mean that micrometeoroids pose a significant threat to spacecraft and artificial satellites. ◇ A micrometeoroid that reaches the surface of the Earth, the Moon, or another celestial body is called a micrometeorite. The tiny size of micrometeoroids allows them to radiate away the heat generated by friction with the atmosphere, with the result that the proportion of micrometeoroids becoming micrometeorites is greater than the proportion of meteoroids becoming meteorites.

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    [mahy-kroh-mee-tee-uh-rol-uh-jee] /ˌmaɪ kroʊˌmi ti əˈrɒl ə dʒi/ noun 1. the study of local and small-scale atmospheric phenomena, usually confined to the physical and dynamic occurrences within a shallow stratum of air adjacent to the ground. /ˌmaɪkrəʊˌmiːtɪəˈrɒlədʒɪ/ noun 1. the study of the layer of air immediately above the earth and of small-scale meteorological processes micrometeorology […]

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    [mahy-krom-i-ter] /maɪˈkrɒm ɪ tər/ noun 1. any of various devices for measuring minute distances, angles, etc., as in connection with a telescope or microscope. 2. Also called mike. micrometer caliper. a precision instrument with a spindle moved by a finely threaded screw, for the measurement of thicknesses and short lengths, commonly used by machinists for […]



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